A tray feeder extracts one of trays where components are stored from corresponding one of magazines, and moves the extracted tray to a component feed position. The tray feeder includes a rack portion having a plurality of magazine holding portions disposed in a vertical direction, and a tray movement portion that extracts one of the trays from corresponding one of the magazines through a corresponding one of tray extraction ports. The magazine holding portions hold the magazines respectively which are inserted horizontally through magazine exits/entrances. Each of the magazine holding portions includes a block unit which blocks communication between the magazine exit/entrance and the tray extraction port of corresponding magazine holding portion when the magazine is removed from the corresponding magazine holding portion through the magazine exit/entrance.